|Publication number||US4932967 A|
|Application number||US 07/253,066|
|Publication date||Jun 12, 1990|
|Filing date||Sep 30, 1988|
|Priority date||Sep 30, 1988|
|Publication number||07253066, 253066, US 4932967 A, US 4932967A, US-A-4932967, US4932967 A, US4932967A|
|Inventors||Peter G. Kansas|
|Original Assignee||Kansas Peter G|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Non-Patent Citations (4), Referenced by (7), Classifications (5), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention generally relates to an intraocular lens implant suited for use as an artificial lens implant in a chamber of an eye and specifically concerns such intraocular lens implants having outwardly projecting, positioning and supporting members of a significantly improved design for facile trouble-free implantation.
An intraocular lens is employed as a replacement for a human crystaline lens and is generally of two types, those that are placed in an anterior chamber of an eye, i.e., between its iris and cornea, and those that are placed in a posterior chamber, i.e., behind the iris.
Intraocular lens implants normally include an optic with two or more positioning and supporting members or haptics which extend from the optic and engage tissue of an eye requiring such an artificial lens. The optic normally comprises a circular transparent optical lens body. The haptics may be of widely varying styles and construction depending upon the intended location of the haptics, their fixation points within the eye chamber, and whether the eye itself has undergone extracapsular cataract surgery or intracapsular cataract surgery.
An aim of achieving stable fixation of such intraocular lens implants is continuously sought to ensure visual rehabilitation without postoperative complications or tissue irritation following implantation.
Accordingly, a primary object of this invention is to provide a new and improved intraocular lens implant having a haptic design featuring sufficient flexibility for the stable positioning and supporting of a lens in a desired operative position within a human eye.
Another object of this invention is to provide such an implant which is readily adapted to be manufactured in a quick and easy manner at reasonable cost.
Yet another object of this invention is to provide such an implant which provides both enhanced centration and enhanced fixation during implantation and which features a design configuration which promotes more certain and easier intraocular insertion and placement during surgery.
A further object of this invention is to provide such an implant with a haptic configuration which provides improved snag-resistance while permitting one-handed manipulation of the implant, leaving the surgeon with a free hand to perform ancillary supportive movements.
Other objects will be in part obvious and in part pointed out in more detail hereinafter.
An intraocular lens implant for eyes constructed in accordance with this invention comprises a generally circular optical lens having a pair of resiliently deformable haptics for fixing and supporting the lens in an eye, the haptics extending generally in opposite directions from diametrically opposed regions of the lens for flexure radially of the lens, the haptics each having an outer haptic segment extending along an arc generally concentric to the lens, one of the outer haptic segments having a pair of protrusions formed thereon, the protrusions extending outwardly relative to the lens beyond a projection of said arc containing said one outer haptic segment, the protrusions forming spaced discrete focal points of contact intermediate the length of said one outer haptic segment, the other outer haptic segment being configured to extend in an uninterrupted arcuate form, the protrusions on said one outer haptic segment cooperating with a broad arc of contact formed by the other outer haptic segment to provide improved centration and enhanced fixation upon implantation in an eye.
A better understanding of the objects, advantages, features, properties and relations of the invention will be obtained from the following detailed description and accompanying drawing which set forth an illustrative embodiment and is indicative of the way in which the principle of the invention is employed.
FIG. 1 is a front view of an intraocular lens implant incorporating this invention;
FIG. 2 is a side elevational view of the implant of FIG. 1;
FIG. 3 is an enlarged view, partly broken away, of a portion of a haptic of the implant of FIG. 1; and
FIG. 4 is a cross-sectional schematic view of an eye with its normal lens removed.
Referring to FIG. 1, an intraocular lens implant 10 is illustrated and will be understood to be particularly suited for implantation in a human eye such as shown at 12 (FIG. 4), particularly in a posterior chamber 14 of eye 12. Eye 12 includes a cornea 16 through which light is transmitted to pass through an anterior chamber 18 and the fluid within that chamber whereupon the light would normally have impinged upon a crystaline lens (not shown) serving as a focusing device for light to impinge upon a retina, not shown. The lens normally is encased within a sac, which is shown in part at 20 which will be understood to be what remains as the lens capsule in an extracapsular eye following surgery wherein at least part of the capsular tissue is left intact within eye 12 (in contrast, intracapsular surgery involves removal of the crystaline lens together with its supporting capsular tissue.) In either event, surgical removal of the crystaline lens results in the loss of the ability of the eye to focus and, hence, the necessity for an artificial lens implant or lens 10.
The lens 10 is shown having a generally circular plano-convex body 10A and may be molded, if desired, from a clear polymeric material such as a polymethylmethylacrylate or other suitable biocompatible, non-absorbable and non-toxic material.
Lens 10 is shown also having a pair of resiliently deformable haptics 22,24 of generally circular cross-section for fixing and supporting lens 10 in an eye 12. These haptics 22,24 and optical lens 10 may be of one-piece construction or integrally formed from separate pieces with the haptics firmly inserted into openings (not shown) formed in the optical lens. Haptics 22,24 extend symmetrically from opposite sides of the periphery of lens 10 in opposite directions. Haptic 22 is shown as having an inner segment 26 connected to the lens 10, a reversely oriented outer segment 28 and a u-shaped connecting segment 30 joining the inner and outer segments 26,28. The outer segment 28 extends along an arc generally concentric to lens 10.
Haptic 24 is formed with an inner segment 32 and a connecting segment 34 which are identical but in mirror image relation to their corresponding segments 26 and 30 of haptic 22. In accordance with one feature of this invention, the outer segment 36 of haptic 24 includes an outwardly opening notch 38 intermediate the length of the outer haptic segment 36 between its opposite ends and features a pair of protrusions 40,42 formed on haptic 24.
More specifically, protrusions 40,42 act to prevent decentration during implantation and to provide positive resistance to undesired rotation. Protrusions 40, 42 thus provide discrete focal points of contact or points of fixation with either capsular tissue 20 or ciliary sulcus tissue 44 (FIG. 1) in the case of intracapsular surgery, thereby enhancing stabilization and providing more secure fixation. The protrusions 40,42 are each formed, as best seen in FIG. 3, to project beyond an arc illustrated in broken lines at 46, which arc contains the adjacent portions 36A, 36B of the outer haptic segment 36 on opposite sides of notch 38 in the illustrated normally relaxed condition of the haptic segment 36, thereby insuring the effectiveness of the protrusions 40, 42 as focal contact points during fixation of the implant.
By virtue of the described construction, protrusions 40,42 of outer haptic segment 36 cooperate with adjacent portions 36A, 36B and provide discrete point contact engagement with the ocular tissue adjacent its surface-to-surface engagement provided by portions 36A and 36B (FIG. 3). Jointly cooperating with outer haptic segment 36 is the entire outer segment 28 of haptic 22. Segment 28 as disclosed is configured to provide a continuously curved arc or length of material for uninterrupted surface-to-surface contact with the tissue surface within eye 12 which is contacted upon implantation.
As best seen in FIG. 2, the haptics 22,24 each are formed with their inner segment 26,32 connected to lens 10 and extend from opposite sides of the periphery of the lens 10 in opposite directions with each haptic 22,24 disposed on a common side of a planar surface 10B of the lens. The reversely curved haptic configuration is particularly suited to be adjusted to provide an expansive tension upon being compressed during implantation for preventing undesired displacement while maintaining centration of the lens. The haptics 22,24 are shown respectively contained in planes each extending at a common predetermined angle (shown as "A" in FIG. 2) relative to the planar surface 10B of lens 10 for directing forces of the haptics posteriorly to the lens 10 during expansion and fixation of the haptics upon their being engaged with the ocular tissue.
In accordance with another aspect of this invention, the haptics 22,24 each have a free terminal end 48, 50, a portion of which is of enlarged cross-section forming a snag-resistant, solid broadened tip directed radially inwardly toward the lens 10. The tip of each free terminal end have opposite major surfaces, such as shown at 48A, 50A and 50B extending generally radially of the lens 10 and contained in the same planes containing haptics 22, 21.
It accordingly will be seen that the intraocular lens implant of this invention is particularly suited for implantation in a posterior chamber of an eye either in engagement with capsular tissue or ciliary sulcus tissue. The disclosed structure features free terminal ends of haptics which are snag-resistant, less bulky and less space occupying and which, accordingly, do not interfere with insertion when the haptics are maximally compressed against the optical lens 10 during intraocular placement. Such compression is accomplished in a conventional manner by a surgeon to bend the resiliently deformable haptics 22,24 toward the optical lens 10 without flexing the lens. To insure that the haptics 22, 24 will not overlap and extend beyond the edges of the optical lens 10 during such compression, or otherwise interfere with its visualization or with placement of the implant during surgery, the chordal length (dimension 52 in FIG. 1) between opposite ends of the outer haptic segments 28, 36 are each slightly less than 6.0 millimeters (when in a relaxed condition as viewed in the drawing) which is less than the diameter of the optical lens, preferably of 6.5 millimeters. Accordingly, the reduced chordal dimension of the outer haptic segments (such as at 52) enhances the contact between ocular tissues and the haptics and allows for more certain and easier insertion and placement because it is a smaller dimension than the optical lens 10. Moreover, the concentricity of the outer haptic segments 28, 36 relative to lens 10 provides a more compact construction which is easy to manipulate during surgery.
As will be apparent to persons skilled in the art, various modifications, adaptations and variations of the foregoing specific disclosure can be made without departing from the teaching of this invention.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5078740 *||Apr 2, 1990||Jan 7, 1992||Walman Gerald B||Intraocular lens|
|US5156607 *||Sep 25, 1991||Oct 20, 1992||Peter G. Kansas||Manual small incision cataract extraction method and instrument|
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|US5578082 *||May 27, 1994||Nov 26, 1996||Allergan||IOL for optimal capsular bag fit|
|US6235055||Aug 9, 1999||May 22, 2001||Milton W. Chu||Intraocular lens having colored haptics for anterior/posterior orientation, and method for implanting it|
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|Cooperative Classification||A61F2/1613, A61F2002/1683|
|Aug 18, 1992||CC||Certificate of correction|
|Nov 29, 1993||FPAY||Fee payment|
Year of fee payment: 4
|Feb 14, 1998||REMI||Maintenance fee reminder mailed|
|Jun 14, 1998||LAPS||Lapse for failure to pay maintenance fees|
|Aug 25, 1998||FP||Expired due to failure to pay maintenance fee|
Effective date: 19980617